A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER

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Conference article in proceedings
Date
2020-06
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Language
en
Pages
6
1106-1111
Series
2020 IEEE International Symposium on Information Theory, ISIT 2020 - Proceedings, IEEE International Symposium on Information Theory
Abstract
Two-way quantum key distribution (QKD) protocols can provide positive secret key rates for considerably higher quantum bit error rates (QBER) than one-way protocols. However, when QBER is low, only modest key rate gains have been achieved. This is one of the major obstacles for using two-way protocols. In this paper we introduce a new two-way QKD protocol which is a step towards overcoming this shortcoming. Under the assumption that the eavesdropper can only perform individual symmetric quantum attacks, our protocol performs quantum key distribution with a secret key rate that is higher than the information theoretical bound limiting the performance of any one-way protocol. This holds true also for very low QBER values.
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Lietzen , J , Vehkalahti , R & Tirkkonen , O 2020 , A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER . in 2020 IEEE International Symposium on Information Theory, ISIT 2020 - Proceedings . , 9174522 , IEEE International Symposium on Information Theory , IEEE , pp. 1106-1111 , IEEE International Symposium on Information Theory , Los Angeles , California , United States , 21/07/2020 . https://doi.org/10.1109/ISIT44484.2020.9174522